Genetics analysis of nitrogen use efficiency component traits under nitrogen-limiting environment

Ranjan, Rumesh; Yadav, R. K.

doi:10.1007/s42976-020-00063-8

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…The inability of a large number of SSR loci (47 out of 103) to differentiate dominant homozygote with heterozygote might have led to a preponderance of nonadditive gene action in F 2 . Contrasting results have been reported by other workers who detected both additive and non-additive effects on NUE [73,74] while the additive gene effect under LN environment and the non-additive gene effect under HN environment have been studied in maize [62]. In contrast, NUE has been believed to inherit in the additive fashion under a normal nitrogen environment and the non-additive fashion under a LN environment in rice [75] and wheat [76].…”

Section: Identification Of Qtls For Nue Related Traitsmentioning

confidence: 59%

Epistatic QTLsPlay a Major Role in Nitrogen Use Efficiency and Its Component Traits in Indian Spring Wheat

et al. 2021

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Nitrogen use efficiency (NUE) in wheat may significantly reduce the excessive use of N fertilizers. However, being a quantitative trait, understanding its genetic basis is required for efficient wheat breeding. The present study was carried out to dissect the complex trait through the mapping of quantitative trait locus (QTLs) related to NUE component traits in Indian wheat. A linkage map was constructed using F2 population derived from two parents contrasting for nitrogen-responsive traits using simple sequence repeat (SSR) markers. Phenotyping for root dry weight, N uptake and utilization were carried out under a high nitrogen environment. Twenty-seven main effect QTLs for eight traits and 26 interaction QTLs for three traits were detected. The main effect QTLs explained a significant amount of phenotypic variance up to the extent of 11.18%. The QTLs were also found to have significant epistatic interactions governed by both additive and non-additive gene action. In particular, chromosome 2A harbours QTLs for many traits viz. SDW, RDW, TDW, R:S, %N, NUtE, and NUpE, including epistasis and interaction QTLs that were flanked by markers Xwmc728-Xwmc473 and Xwmc779-Xgwm249. Taken together, the genomic regions on 2A, 4A, and 7A were found to contain QTLs for a majority of the studied NUE traits that can be potentially exploited in future wheat breeding programmes.

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Section: Identification Of Qtls For Nue Related Traitsmentioning

confidence: 59%

Epistatic QTLsPlay a Major Role in Nitrogen Use Efficiency and Its Component Traits in Indian Spring Wheat

et al. 2021

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“…Based on mean gram N in the shoot (gN), extreme seven genotypes (High gN and low gN) were selected (Table 1) where gram N in the shoot (gN) = N % in shoot × Shoot dry weight (g). The N % in the shoot was estimated by the Micro-Kjeldahl method (Ranjan and Yadav 2020). The MRL (cm) was measured at harvest from the shoot base to the longest root tip.…”

Section: Resultsmentioning

confidence: 99%

“…In an empirical plant breeding approach knowledge of gene action governing the trait of importance (NUE traits) helps the breeder to design the breeding programme properly. Germplasm bases used by Indian breeders have hardly been evaluated for these traits and only limited information is available on the genetics of NUE (Yildirin et al 2007, Gorny et al 2011, Al-Naggar et al 2015, Ranjan and Yadav 2020 in wheat. As most of these studies were on European winter wheat and there was an urgent need for such study on Indian breeding material to develop N responsive wheat varieties.…”

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confidence: 99%

Genetics of nitrogen use efficiency and its component traits under nitrogen-rich environment in wheat (Triticum aestivum)

Ranjan

Yadav

2021

Indian J Agri Sci

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Minimizing the footprints of overuse of nitrogen (N) on the ecosystem is the need of an hour. There is little information on the genetic inheritance of NUE and its component traits. The present study was therefore designed to study the genetic behaviour of NUE traits under abundant N supply. Diallel analysis of 21 F1 along with 7 parents was carried out for NUE traits, viz. shoot dry weight (SDW), root dry weight (RDW), maximum root length (MRL), N% in shoot, gram N in shoot (gN) and nitrogen use efficiency (NUE) under high N in hydroponic condition. Analysis of variance revealed significance for both general combining ability (GCA) and specific combining ability (SCA) for all NUE traits indicating the importance of both additive and non-additive gene action for these traits. Baker's ratio revealed a preponderance of additive genes over non-additive for SDW, RDW and MRLsuggesting thereby effectivity of selection for SDW, RDW, gN, and MRL in the early segregating generation of high GCA lines can improve NUE under high N. Crosses with high SCA effects for SDW, RDW, gN and N% were from the parent combination of high × low GCA effects, whereas for MRL, low × low GCA parents resulted in crosses with high SCA effect indicating the dispersal of favourable alleles in the different parents. Our study indicates the feasibility of improvement of NUE through direct selection for the component traits under N rich environment.

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A comparative analysis of root traits in diverse wheat seedlings screened under optimum and low nitrogen stress in hydroponics

Tiwari,

Anand,

Sharma

et al. 2023

Plant Physiol. Rep.

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Genetics analysis of nitrogen use efficiency component traits under nitrogen-limiting environment

Cited by 7 publications

References 29 publications

Epistatic QTLsPlay a Major Role in Nitrogen Use Efficiency and Its Component Traits in Indian Spring Wheat

Epistatic QTLsPlay a Major Role in Nitrogen Use Efficiency and Its Component Traits in Indian Spring Wheat

Genetics of nitrogen use efficiency and its component traits under nitrogen-rich environment in wheat (Triticum aestivum)

A comparative analysis of root traits in diverse wheat seedlings screened under optimum and low nitrogen stress in hydroponics

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